Commit message: Prevent overflow in sparse dense cwise ops.

PiperOrigin-RevId: 415543171
Change-Id: I22dab7c41be2121ab5efe5403ca0e2f9b7cb24b8
CVE: CVE-2022-23567
CWE: CWE-190
Vulnerability description: Tensorflow is an Open Source Machine Learning Framework. The implementations of `Sparse*Cwise*` ops are vulnerable to integer overflows. These can be used to trigger large allocations (so, OOM based denial of service) or `CHECK`-fails when building new `TensorShape` objects (so, assert failures based denial of service). We are missing some validation on the shapes of the input tensors as well as directly constructing a large `TensorShape` with user-provided dimensions. The fix will be included in TensorFlow 2.8.0. We will also cherrypick this commit on TensorFlow 2.7.1, TensorFlow 2.6.3, and TensorFlow 2.5.3, as these are also affected and still in supported range.

Project: tensorflow
File: sparse_dense_binary_op_shared.cc

  void Compute(OpKernelContext *ctx) override {
    const Tensor *indices_t, *values_t, *shape_t, *dense_t;
    OP_REQUIRES_OK(ctx, ctx->input("sp_indices", &indices_t));
    OP_REQUIRES_OK(ctx, ctx->input("sp_values", &values_t));
    OP_REQUIRES_OK(ctx, ctx->input("sp_shape", &shape_t));
    OP_REQUIRES_OK(ctx, ctx->input("dense", &dense_t));

    // Validations.
    OP_REQUIRES(ctx, TensorShapeUtils::IsMatrix(indices_t->shape()),
                errors::InvalidArgument(
                    "Input sp_indices should be a matrix but received shape: ",
                    indices_t->shape().DebugString()));
    OP_REQUIRES(ctx,
                TensorShapeUtils::IsVector(values_t->shape()) &&
                    TensorShapeUtils::IsVector(shape_t->shape()),
                errors::InvalidArgument(
                    "Inputs sp_values and sp_shape should be vectors "
                    "but received shapes: ",
                    values_t->shape().DebugString(), " and ",
                    shape_t->shape().DebugString()));
    OP_REQUIRES(
        ctx, TensorShapeUtils::IsVector(shape_t->shape()),
        errors::InvalidArgument("Input sp_shape must be a vector. Got: ",
                                shape_t->shape().DebugString()));
    OP_REQUIRES(
        ctx, values_t->dim_size(0) == indices_t->dim_size(0),
        errors::InvalidArgument(
            "The first dimension of values and indices should match. (",
            values_t->dim_size(0), " vs. ", indices_t->dim_size(0), ")"));
    OP_REQUIRES(
        ctx, shape_t->shape().dim_size(0) == indices_t->shape().dim_size(1),
        errors::InvalidArgument(
            "Number of dimensions must match second dimension of indices. ",
            "Got ", shape_t->shape().dim_size(0),
            " dimensions, indices shape: ", indices_t->shape().DebugString()));
    OP_REQUIRES(ctx, shape_t->NumElements() > 0,
                errors::InvalidArgument(
                    "The shape argument requires at least one element."));

    const auto indices_mat = indices_t->matrix<int64_t>();
    const auto shape_vec = shape_t->vec<int64_t>();
    TensorShape lhs_shape;
    OP_REQUIRES_OK(ctx, TensorShape::BuildTensorShape(shape_vec, &lhs_shape));
    const auto lhs_dims = BCast::FromShape(lhs_shape);
    const auto rhs_dims = BCast::FromShape(dense_t->shape());
    BCast b(lhs_dims, rhs_dims, false);  // false for keeping the same num dims.

    // True iff (size(lhs) >= size(rhs)) and all dims in lhs is greater or equal
    // to dims in rhs (from right to left).
    auto VecGreaterEq = [](ArraySlice<int64_t> lhs, ArraySlice<int64_t> rhs) {
      if (lhs.size() < rhs.size()) return false;
      for (size_t i = 0; i < rhs.size(); ++i) {
        if (lhs[lhs.size() - 1 - i] < rhs[rhs.size() - 1 - i]) return false;
      }
      return true;
    };
    OP_REQUIRES(ctx, VecGreaterEq(lhs_dims, rhs_dims) && b.IsValid(),
                errors::InvalidArgument(
                    "SparseDenseBinaryOpShared broadcasts dense to sparse "
                    "only; got incompatible shapes: [",
                    absl::StrJoin(lhs_dims, ","), "] vs. [",
                    absl::StrJoin(rhs_dims, ","), "]"));

    Tensor *output_values = nullptr;
    Tensor dense_gathered;
    const int64_t nnz = indices_t->dim_size(0);
    OP_REQUIRES_OK(ctx,
                   ctx->allocate_output(0, TensorShape({nnz}), &output_values));
    OP_REQUIRES_OK(
        ctx, ctx->allocate_temp(DataTypeToEnum<T>::value, TensorShape({nnz}),
                                &dense_gathered));
    bool op_is_div = false;
    if (absl::StrContains(ctx->op_kernel().type_string_view(), "Div")) {
      op_is_div = true;
    }
    // Pulls relevant entries from the dense side, with reshape and broadcasting
    // *of the dense side* taken into account.  Use a TensorRef to avoid blowing
    // up memory.
    //
    // We can directly use the sparse indices to look up dense side, because
    // "b.y_reshape()" and "b.y_bcast()" are guaranteed to have rank "ndims".
    auto dense_gathered_flat = dense_gathered.flat<T>();
    const int ndims = lhs_dims.size();
    switch (ndims) {
#define CASE(NDIM)                                                             \
  case NDIM: {                                                                 \
    TensorRef<Eigen::Tensor<const T, NDIM, Eigen::RowMajor>> rhs_ref =         \
        dense_t->shaped<T, NDIM>(b.y_reshape())                                \
            .broadcast(BCast::ToIndexArray<NDIM>(b.y_bcast()));                \
    Eigen::array<Eigen::DenseIndex, NDIM> idx;                                 \
    bool indices_valid = true;                                                 \
    for (int i = 0; i < nnz; ++i) {                                            \
      for (int d = 0; d < NDIM; ++d) {                                         \
        idx[d] = internal::SubtleMustCopy(indices_mat(i, d));                  \
        if (!FastBoundsCheck(idx[d], rhs_ref.dimension(d))) {                  \
          indices_valid = false;                                               \
        }                                                                      \
      }                                                                        \
      OP_REQUIRES(                                                             \
          ctx, indices_valid,                                                  \
          errors::InvalidArgument("Provided indices are out-of-bounds w.r.t. " \
                                  "dense side with broadcasted shape"));       \
      dense_gathered_flat(i) = rhs_ref.coeff(idx);                             \
      if (op_is_div) {                                                         \
        OP_REQUIRES(ctx, dense_gathered_flat(i) != 0,                          \
                    errors::InvalidArgument(                                   \
                        "SparseDenseCwiseDiv cannot divide by zero,"           \
                        "but input dense tensor contains zero "));             \
      }                                                                        \
    }                                                                          \
    break;                                                                     \
  }

      CASE(1);
      CASE(2);
      CASE(3);
      CASE(4);
      CASE(5);
      default:
        OP_REQUIRES(
            ctx, false,
            errors::InvalidArgument("Only tensors with ranks between 1 and 5 "
                                    "are currently supported.  Tensor rank: ",
                                    ndims));
#undef CASE
    }

    output_values->flat<T>().device(ctx->eigen_device<Device>()) =
        values_t->flat<T>().binaryExpr(dense_gathered_flat,
                                       typename Functor::func());
  }